Electric switch.



H. R. SCHULTZ & F. B. HOLT. ELECTRIC SWITCH.

APPLICATION FILED OUT} 31, 1910.

1 1 30 204 Patented Mar. 2,1915.

v fiv NTORS ATTORNEY the mannfa cture facilitated entrain ern'rns PATENTcanton.

melanin ta. scnomz Ann nnnnnmcn BRERETON em. or ivmncnns'rnn, nneannn,

ASSIGNORS TO- WESTINGHOUSE BATION QB PENNSYLVANIA:

. ELECTRIC inccg'eoe.

Yb auto/ 10m it concern I lie it known that we, :HJALMAR RUDMAN SCHULTZand Fnnnmncn BnnnETon HOLT, subjects, respectively, of the King ofSweden and the King of England, and residents of lllanchester in thecounty of Lancaster, l lnglancl. have invented a new and usefullmprorcmentin Electric Switches, oi'which the following is aspecification.

vOur invention relates to electric switches and particularly to switcheswhich are employed in connection with high-tensioncircuits and have alllive parts completely ing closed. In these switches, it is usual toprovide a coil or. coils in the high-tension circnit having an armatureor plunger which is adapted to act upon a trip mechanism and open theswitch when the current in the circuit exceeds a predetermined limit,and to also provide acoil which is included in the secondary circuit ofa shunt transformer,

mounted in thenwiteh case. and serves to I hold the trip mechanism ofthe switch normally in locking position but releases it when the roltageof the circuit falls below-a certain limit. .i'he above mentioned coilswill he hereinafter referred to as an overload coil and a no-voltagecoil, respectively. The switch is also usually provided with an ammeterwhich indicates the current passing in the hightcnsion circuit.

According to the present invention, the construction of the switch issimplified and and cheapenecl by mechanically supporting the overloadcoil and the ammeter directly upon the high-tension conductor to whichthey areelectrically connected.

A further feature of the'inventicn consists in locating thetripmechanism' in a sep arate casing which is readily acoessibleifor Iinspection and adjustment, the actuating members for the said mechanismbeing on tirelly insulated frorn those portions ofthe switch which aresubjected to a=higl1-p otentlal.

. panying drawing,

' The invention is illustrated in the accozm.

in which- Y Fignrel is a view in side elevation, partly sectional. of a.switch constructed in accordance with the invention, and. Fig.2 is a"detail View, in end elevation. of a portion of the mechanism shown inFig. 1. v

Referring now to the drawing, the switch mechanism is i'ncloscd in acasing compris- ELECTRIC 8; MANUFACTURINQ:

Specification 01' Letters Patent.

Application filed October 31,

coneanr, A cameo swltrcn.

- I Patented Mar. 2, tint-3. 1910. Serial No. 590,097.

ing a'body portion 1, an .oil tank 2. within which the switch contactterminals lo cated, and a hood or cap 3. The high tension terminals 4and 5 ofthe switch enter the body portion 1 through insulating hash-1ngs 6 and terminate, Within the said body portion, 111 rods 7 and 8,respectively. n

be stationary contact terminals switch are indicated at 9 and 1,0 and.are mounted upon insulated supports 11, with- 1n the oil tank 2, themovable member of the switch comprising an'insulated bridge piece lcarrying contact terminals 13 and it which are adapted to engage therespective stationarv contact term nals 9' and 10 when the switch isclosed. The bridge piece 12 is arranged to be raised andopen the switch,which are cmeraterl bv levers 16. one end of each of which is attachedto a shaft 17 that IS actuated by means of an external handle (notshown).

by means of rods 15 of the and lowered. to close The lever 16 is shownin the drawing as being in a posit on closed position of the I switchand is normallv retained in this pos t on bv means of corresponding tothe 1 suitable mechanism 18 wh ch is located in an auxiliary casino 18.The free end of le er 16 is emb aced hv the prongs of a bifurcated latch38 th t is pirotallv moimtcd in the casing 18. non-bifurcated end of thelatch 38 is non mallv engaged bv a ro er 39 with which a pi otallvmounted locking le er 40 is provided. the locking engagement be ng: insued bv a we ght 41 at one end of the lever. The roller 39 of the lockingle er 0 s moved out o engagement with the latch 38-hv reason of the engaement of vo d 43 with the leven'st'vch en g a vitv whentha voltageofthecircuit to which the-solenoid is connected fails or hec'omes reduced theco e 42 of a ticle- The locking lever may also he actiiated The upperedge m the .the free end of an a m 44 of to a predetermined minimum Igaa'ementhe na effected by either .manuallvt or clectromagnetically, to

rocking a hell crank cause the end of one iotare

' bent downward and riveted to a connector being interposed between theextension.

22 that surrounds the rod '7 and is secured thereto by lock nuts 23. Theother end 24 of the overloadcoil 19 is attached, by means of bolts 25,:to' a conductor 26 that c0nstitutes one vofthe terminals of the ammeter20.

The latter is mainly supported by means of a a bar 27 which alsoconnects the other terminal of the ammeter to one of the sta' tionarycontact terminals 10 of the switch,

the other contact itenminal ,llsbeing connected to the rod 8 by a bar28. The ammeter'QO may also have a steadying or bracing connection .to abracket 4:9, as shown in the drawing. The bar 27 is supported on anextension 29021' the rod 7, an insulating sleeve 29 and the .bar 21?,The bar 27 also serves to support the magnetizable frame 31 of theoverload .coil 19, the said frame being attached .to the bar 2 7 bymeans .of rivets, ,shown inthe drawing. 1 i

The complete circuit through the apparatus, when the switch is closed,may be traced ,as follows: from the high-tensionterminal 4;, through therod 7, connector 22, terminal 21, overload coil 19, terminal 24:,conductor Qtflammeter 20, bar 27, stationary contact terminal .10,movable contact terminal 1%, bridge piece 12, movable contact terminal13, stationary contact terminal 9 and bar 28, .to the other high-tensionterminal i The insulating'sleeve- 30 which is intenposed bBtWGQlljbllG,e'iitensicn 29 and the bar-'27, isprovided'jtir the purpose ofwithstanding the small drop in voltage through the overload coil 19 andthe ammeter 20.

The overload trippingdevice comprises, in

addition to the ,coil 19 and its trams 31, a movable core 32 which, whenanoverload occurs, actuates an arm 33xthat is vamounted on a shaft 3iand is well. insulated therefrom. The shaft 3% is connected to a lever35 the free end .of which projects Within the casing '18 and serves toactuate the opening mechanism of the switch, upon the occurrence ofanoverload. The Inc-voltage coil of the switch, previously referred to,isal'so located within the casing '18 and is supplied with current fromthe hightension circuit, through a shunt transformer hight-tensionvfuses 37.

As will beseen from the drawings, all the parts of the apparatus whichare subject to a high potential are located within the main switchcasing 1, 2, 3, the casing 18 which contains the operating mechanismbeing entirely isolated from all these parts. The

36 and ranged to be readily removable and, as it is in connection withthis part of the apparatus that diliiculties arise, the possibility ofinspecting and adjusting the mechanism, which is afforded by thisconstruction, is, of great advantage, since it may be performed whilethe switch is connected to the hightension circuit, owing to the factthat the mechanism contained within the casin 18 is entirely isolatedfrom those parts 0 the switch which are subject to a high potential.

The switch may be, and preferably is, pro

vided with arrangements for preventing the removal of the oil tank Qanclthe hood 3, so long as the switch is in its closed position and isconnected to the high tension circuit, arrangements of this kind beingwell known in the art. i

The structural details for carrying the invention into practice mayevidently be considerably varied from those above described withoutexceeding the scope of the invention.

We claim as our invention:

1. Electric switching apparatus for hightensicn circuits comprising anoverload tripping coil having an electrical connection to one oi thehighetension circuit leads and supported thereby, an amn'ieter mainlysup ported by said high tension lead one of its conducting leads from.which it is insu lated. and a casingfor said apparatus.

2. In a switch for high-potentialcircuits, a main casing having terminalrods mounted in one of its walls, an overload magnet supported .upon oneof said rods and electrical-ly connected thereto by a single means, ameasuring instrument Iflallllff supported upon one ofsa-id terminal rodsand elcctri- 4. In a switch for high-potential circuits,-

a, main casing, an auxiliary casing. contact terminals and an overloadmagnet in said mam casino, and a no-voltagc n'iagnct and.

locking and releasing mechanism in said. auxiliary in a switch forelectrical circuits, the combination with a main cosine; having terminalrods mounted in one of its walls, of

cqntact an overload magnet supported by one of said rods, a' upplementalcasing, a no-voltage magnet and locking and releasing devices in saidsupplemental casing, and a tripping lever interposed between saidreleaslng devices and said overload magnet.

v 6. In a switch for electrical circuits, the combination with a. maincasing and a supplemental casing, of an overload magnet located in saidmain casing, a no-voltage coil and locking ,and releasing deviceslocated in said supplemental casing, and a trippinglever interposedbetween said overload magnet and said releasing devices.

7. In a switch for high-potential circuits,

a main casing having terminals inserted therein, an auxiliary casing,cooperating contact members and an overload magnet in said main casing,means for supporting said overload magnet upon said terminals insertedin said casing, and a no-voltage magnet and locking and releasingmechanism in said auxiliary casing,

8. In a switch for high-potential circuits, :1 main casinghaving'terminals inserted therein, an auxiliary casing, cooperatingcontact members and an overload magnet in said main casing, means forsupporting *said overload magnet upon said terminals inserted in saidcasing, a no-voltage magnet located intsaid auxiliary casing, and meanswithin said auxiliary casing for releasing said contact member inresponse to the operation of both magnets. a

In testimony whereof, we havehereunto subscribed our names this 14th dayof October 1910.

H. R. SCHULTZ. FREDERICK BRERETON HULT.

\Vitnesses HENRY CAJETAN .Pmason, ARTHUR PICK. Bnioos.

